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Establishing OPC Communication on Windows XP SP2 and Windows 2003 SP1
July 4, 2006
Matrikon Inc. 10405 Jasper Avenue Suite 1800 Edmonton, AB T5J 3N4 Canada Phone 780-448-1010 Fax 780-448-9191 Web www.matrikon.com Support Site www.opcsupport.com

Users will often experience difficulties with OPC Communication on Windows XP SP2 and Windows 2003 SP1 due to advanced security settings. Thisdocument describes how to disable these security settings to allow OPC Communication. DCOM Security Settings OPC uses ActiveX COM and DCOM to communicate, so we must open our DCOM permissions to allow this. 1. Go to ‘Start->Run’

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2. Type in ‘dcomcnfg’ and click OK.

3. Go to ‘Console Root->Component Services->Computers->My Computer’. Right-click on ‘My Computer’ and select ‘Properties’.

4. Go to the ‘DefaultProperties’ tab and ensure that your Window matches the one shown below:

5. Go to the ‘COM Security’ tab. Under ‘Access Permissions’, click on the ‘Edit Limits’ button.

6. Ensure that you have allowed permissions to ‘Anonymous Logon’, ‘Everyone’, ‘Interactive’, ‘Network’, and ‘System’ as shown below. Then click OK.

7. Under ‘Access Permissions’, select the ‘Edit Default’ button.

8. Ensurethat you have allowed permissions to ‘Anonymous Logon’, ‘Everyone’, ‘Interactive’, ‘Network’, and ‘System’ as shown below. Then click OK.

9. Under ‘Launch and Activation Permissions’, select ‘Edit Limits’.

10. Ensure that you have allowed permissions to ‘Anonymous Logon’, ‘Everyone’, ‘Interactive’, ‘Network’, and ‘System’ as shown below. Then click OK.

11. Under ‘Launch and ActivationPermissions’ select ‘Edit Default’.

12. Ensure that you have allowed permissions to ‘Anonymous Logon’, ‘Everyone’, ‘Interactive’, ‘Network’, and ‘System’ as shown below. Then click OK.

13. We have successfully configured the default DCOM settings. Click OK to return to the Component Services window.

14. Under ‘My Computer’, open the folder labelled ‘DCOM Config’

15. Browse to your OPCServer, right-click on it, and select ‘Properties’.

16. Under the ‘General’ tab, set the Authentication Level to ‘Connect’.

17. Go to the ‘Security’ tab. Under ‘Launch and Activation Permissions’, select the ‘Customize’ button. Then click Edit.

18. Ensure that you have allowed permissions to ‘Everyone’, ‘Interactive’, ‘Network’, and ‘System’ as shown below. Then click OK.

19. Under‘Access Permissions’ choose the ‘Customize’ button. Then click Edit.

20. Ensure that you have allowed permissions to ‘Everyone’, ‘Interactive’, ‘Network’, and ‘System’ as shown below. Then click OK.

21. Go to the ‘Identity’ tab. Ensure that your server is either running as ‘The interactive user’ OR, if it is running as a service, ‘The system account’. Click OK to return to the ComponentServices window.

22. In the ‘DCOM Config’ folder browse to ‘OpcEnum’. Right click on it and select ‘Properties’.

23. Under the ‘General’ tab ensure that the Authentication Level is set to ‘Connect’.

24. Go to the ‘Security’ tab. Under ‘Launch and Activation Permissions’, select the ‘Customize’ button. Then click Edit.

25. Ensure that you have allowed permissions to ‘Everyone’,‘Interactive’, ‘Network’, and ‘System’ as shown below. Then click OK.

26. Under ‘Access Permissions’ select the ‘Customize’ button. Then click Edit.

27. Ensure that you have allowed permissions to ‘Everyone’, ‘Interactive’, ‘Network’, and ‘System’ as shown below. Then click OK.

28. Go to the ‘Identity’ tab. The user should be set to ‘The system account’, as OpcEnum runs as a service. Click OK....
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